On Aug. 2, 1971, Apollo 15 commander David Scott simultaneously dropped a 1.32-kg (2.91-pound) aluminum geological hammer and a 0.03-kg (0.07-pound) falcon feather on the surface of the Moon to prove that objects undergo the same acceleration in gravity. The falcon feather, which remains on the moon today, was taken from United States Air Force Academy mascot “Hungry” and chosen because the name of the lunar module was Falcon.